Improvement in tool-holding attachments for metal-lathes



W. KRUTZSGH.

Tool-Holding Attachment for Metal-Lathes.

No.166-,787. I76 P atentdAug.17,1875.

)9?!) in ga Ja a? I n 0611/ 1/01 UNITED STATES ATENT OFFICE.

WILLIAM KEUr'zsoH, or DAYTON, OHIO, ASSIGNOR TO GEORGE W. HOGLEN ANDCHARLES E. PEASE, OF SAME PLACE.

IMPROVEMENT IN TOOL-HOLDING ATTACHMENTS FOR METAL-LATHES.

Specification forming part of Letters Patent No. 166,787, dated August17, 1875; application filed April 15, 1875.

To all whom it may concern:

Be it known that 1, WILLIAM KRUTZSCH, of Dayton, in the county ofMontgomery and State of Ohio, have invented new and useful Improvementsin Tool-Holders for Lathe Attachments, of which the following is aspecification The object of my invention is to provide an attachment tobe clamped upon themandrel of a metal-working lathe, that shall serve asa holder for several tools, either one of which, or each successively,may be used upon a piece of work without the usual delay in removing andsubstituting difierent tools.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I would thus describe it, referringto the accompanying drawings, in which- Figure l is a side elevation ofmy improved apparatus. Fig. 2 is a longitudinal central section of thesame.

i B represents the body of my improved at tachment, with a hollow shankto fit upon the mandrel of a lathe, to which it is secured by aclamp-screw passing through ears 0, or in any convenient manner. Theforward part of this body is a circular bearing-face, inclined at anangle of about thirty degrees with the axis of the lathe. I say thirtydegrees, but the angle may be greater or less without interfering withthe application of the principle embodied. The center of the circularface must be cut by the axis of the mandrel, and upon the face issecured, in the manner I shall presently point out, the frustum of acone, A,

wh'ose radial plane, in which the axis lies, has its outside edge, orits edge corresponding with the face of the cone, at right angles-to theaxis of the mandrel, indicated by the dotted lines 00 w. t

I do not wish to confine myself to the particular manner of securing thefrustum to the inclined face, but suggest as best that represented inFig. 2, in which a hollow pivot-bearing, j, with a shoulder or flange atits bottom, is passed through an annular disk, m, screwed into thebearing-face. The flange fits snugly, but free to be turned, into acorresponding recess in the face. The frustum with a central opening isslipped upon the bearing j, to which it is keyed, and a ring, is, actingas a jam-nut, is screwed upon the top of the same bearing.

A pivot, f, at right angles to the plane of the bearing-face, is passedthrough the part j, and is secured in the body B. By tightening orloosening this pivot the frustum can be properly adjusted, so as to beturned with case. A latch, t, with a handle, D, is pivoted in the bodyB, and is held by a spring,g. In the face of the frustum are recesses a,sunk at right angles to the face, and so located that as the frustum isrevolved the centers of these recesses shall successively correspondwith the axis of the lathe mandrel. Tools b, for performing variousdescriptions of work, are secured in the recesses by the set-screws 0.Under each recess is a slot in the frustum engaging with the latch 71,and by means of which the frustum is locked at any point, and heldrigidly.

The particular advantage to be gained by the inclined frustum is, thatin revolving it the projecting tools are inclined, as seen at b, Fig.2,'and do not come in contact with the puppet-head of the lathe,(represented by G,) while at the same time the tool at work is so nearthe mandrel that it is perfectly rigid and not liable to spring.

Another essential advantageis, that different tools secured in thefrustum may be brought to bear upon the same piece of work in rapidsuccession without any of the delay or difliculty consequent uponremoving one and substituting another tool, as is the case in ordinarylathes.

Having fully described my invention, I claim and desire to secure byLetters Patent 1. For attachment to the mandrel of a lathe, thetool-carrying frustum A and body B, the former attached to the latter atan angle, substantially as described.

2. The herein-described improved attachment, consisting of the body B,latch 71, pivot f, bearing j, disk m, ring it, and frustum A, providedwith recesses a and set-screws c, all substantially as described, andfor the purpose specified.

Witness my hand this 8th day of April, A. D. 1875 WILLIAM KRUTZSOH.

Witnesses E. THoMPsoN, GHAs. M. PEoK.

